Saw-guide.



J. L. JOYCE.

SAW GUIDE.

APPLICATION FILED MAY 14, 1912.

1,055,182, Patented Mar.4, 1913.

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J. L. JOYCE.

SAW GUIDE.

APPLICATION FILED MAY 14, 1912. 1,055,1 2, Patented Mar.4, 1913.

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UNITED STATES PATENT OFFICE.

JOHN I1. JOYCE, 0F TOWNSVILLE, NORTH CAROLINA.

SAW-GUIDE.

To all whom it may concern:

Be it known that 1, JOHN L. Joyce, a citizen of the United States, residing at Townsville, in the county of Vance and State of North Carolina, have invented new and useful Improvements in Saw-Guides, of which the following is a specification.

My invention relates to saw guides, the main object of the invention being to pro vide a pair of spaced guide arms having guide fingers secured thereto and adapted to engage the opposite faces of a circular saw, the arms having means attached thereto for throwing them into elevated, unobstructing position merely upon being struck by the end of a log which is larger than the average.

A further object of the invention is the provision of means for separating the guide arms at the instant they are struck by the log so as to render them instantly inoperative and prevent frictional engagement of the guide pins with thefaces of the saw as the arms pass into their elevated position.

A still further object of the invention is the provision of a readily adjustable support for the guide arms and their operating means, which will permit the horizontal adjustment of the arms with respect to the saw.

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a front elevation showing the guide arms in operative position. Fig. 2 is a side elevation thereof. Fig. 3 is a transverse sectional view taken on the line 3-3 of Fig. 2. Fig. 4 is a longitudinal sectional view on the line 4-4 of Fig. 1. Fig. 5 is a front elevation showing the guide arms in,

inoperative position. Fig. 6 is a side elevation showing the arms in similar position.

In the drawings, the numeral 1 designates the saw whose supporting shaft 2 is journaled in suitable bearings on the parallel, horizontally extending supports 3, 4 and 5. A vertically extending side portion 6 of the supporting frame 7 of the device has its lower angularly extending end 8 secured to the support 5 by means of a suitable bolt 9. The upper end of the side portion 6 is Specification of Letters Patent.

Application filed May 14, 1912.

Patented Mar. 4, 1913.

Serial No. 697,251.

extended inwardly, as at 10, and provided with a slot 11. The opposite side portion 12 has its lower laterally bent extremity 13 secured to the supporting member 4 by means of the bolt 14, and has its upper extremity 15 extending outwardly in the same direction as the extension 10 of the portion 6. This extension 15 is likewise provided with a slot 16. An inclined cross bar 17 connects the two side portions 6 and 12, its downwardly extending end 18 being bolted to the portion 6 and its upwardly extendingopposite extremity 19 beingsecured to the portion 12 by means of the cross bolt 20 which connects the said portions adjacent their upper ends. A bed plate 21 formed of angle-iron is mounted upon the laterally eX- tending upper ends of the side portions 6 and 12 of the frame, it being secured in this position by means of the vertically extending bolts 22 and 23 which are slidably received in the slots 11 and 16, respectively. An adjusting head 24 depends from the under face of the bed plate 21 adjacent the inner face of the side portion 12, it being secured to the plate by means of the bolt 25. A horizontal adjusting bolt 26 is rotatably received within the transverse opening in the head, and its outwardly extending extremity is threaded, as at 27, for adjusting engagement with a threaded opening in the slotted portion 12. This screw may be operated by means of the hand wheel 28 provided on its inner end so as to move the bed plate laterally in either direction, the screw 26 being held against slidable movement in the head 24 by the said hand wheel 28 and a removable collar 29.

A hearing block 30 is mounted upon the end of the bed plate 21 adjacent the saw, and is adapted to rotatably mount a hollow guide shaft 31, which latter is provided externally with left hand threads 32 adapted to be received by the internal threads 33 of the block. A second solid guide shaft 34 longer than the hollow shaft has its outer portion rotatably mounted in the hollow shaft 31 so that its corresponding extremity extends outwardly through the end of the hollow shaft past the upper edge of the saw. The opposite end of the shaft 34 is provided with a head 35, which has external, right hand threads 36 formed thereon adapted to be received by the internal thread 37 of a second bearing block 38 secured to the inner portion of the bed plate 21. An inner guide arm 39 has its upper end provided with a transverse opening 40 for the reception of the hollow shaft 31, and is fixedly mounted on the outer end thereof by means of the set screw 41. A second outer guide arm 42 having a transverse opening 43 in its upper end for the reception of the outwardly protruding end of the shaft 34 is fixedly secured to this end of the shaft adjacent the end of the hollow shaft 31 by means of the set screw 44. The lower ends of the guide arms 39 and 42 are provided with transverse threaded openings 45 and 46 for the reception of the inwardly extending threaded bolts 47 and 48, respectively. These bolts 47 and 48 are provided with recesses 49 and 50 in their inner ends to receive the wooden guide pins 51 and 52, whose flanged outer ends 53 and 54 are adapted to frictionally engage the opposite faces of the saw 1 adjacent its upper portion so as to guide the same or prevent lateral motion thereof. The bolts 47 and 48 are thus removable so that the wooden guide pins may be easily replaced.

An overbalancing arm 55 is fixedly secured to the shaft 34 adjacent the inner end of the hollow shaft 31 by means of the set screw 56 and has a lug 57 formed on its lower end at the rear side thereof to engage the bed plate 21 and thus support the arm 55 in a nearly upright position, it being inclined slightly to the rear. A sec: ond overbalancing arm 58 is fixedly secured by means of the set screw 59 to the inner end of the shaft 31 and is provided on the rear side of its lower end with a lug 60 adapted toengage the bed plate 21 so as to support the said arm in a similar position to that of the arm 55. The arms 55 and 58 are provided adjacent their upper ends with the eyes 61 and 62, respectively, to which may be secured the ends of operating cords to be used in restoring the arms to their normal position.

It will thus be seen that, when an un usually large log is fed to the saw, it will strike the guide arms 39 and 42, thereby causing them to oscillate rearwardly, turning their shafts 34 and 31, respectively, in the same direction. This rotation of the shafts in turn throws the overbalancing arms 55 and 58 forwardly, thus releasing the same. These arms then fall forwardly and impart further rotary movement to the shafts. The shafts 31 and 34 being provided with right and left hand threads, respectively, are given longitudinal movement in opposite directions upon their being thus rotated in the same direction. This causes the guide arms 39 and 42 to become instantly separated upon oscillation by contact with the log.

Frictional engagement of the guide pins with the faces of the saw is in this way prevented upon movement of the guide arms into their elevated, unobstructing position.

I claim:

1. A device of the class described comprising a support, a pair of guide arms carried by said support, said arms adapted to be thrown partially out of the path of a log when struck by the same, means for completely throwing said arms out of the path of the log after being struck, and means for synchronously separating said arms.

2. A device of the class described comprising a support, a pair of guide arms carried by said support and adapted to be thrown partially out of the path of a log when struck by the same, gravitational means for throwing said arms completely out of the path of the log after being struck, and means for synchronously moving the arms into separated inoperative position.

3. A device of the class described comprising a support, a hollow guide shaft rotatably mounted on said support, a second guide shaft rotatably mounted in the first shaft, a guide arm fixedly secured to the outer end of each shaft, and a counterbalancing arm secured to each shaft and adapted to throw the guide arms into inoperative position upon the guide arms being struck by a log.

4. A device of theclass described comprising a support, a hollow guide shaft rotatably mounted on said support, a second guide shaft rotatably mounted in the first shaft, a guide arm fixedly secured to the outer end of each shaft, an overbalancing arm fixedly secured to each shaft and adapted to throw the guide arms into inoperative position upon oscillation of the latter, and means for supporting said overbal'ancing arms in operative position.

5. A device of the class described comprising a support, a hollow sha ft rotatably mounted on said support, a second shaft rotatably mounted in the first shaft, a guide arm fixedly secured to the outer end of each shaft, overbalancing arms carried by the said shafts and adapted to throw the guide arms into inoperative position upon their being oscillated, and means for imparting a longitudinal movement to the shaft upon the rotation thereof.

6. A device of the class described comprising a support, a hollow shaft rotatably mounted on said support, a second shaft journaled in the first shaft, a guide arm secured to the outer end of each shaft, means for operating said shafts in the same dlrection to throw the guide arms into inoperative position upon the latter being oscillated, and means for imparting longitudinal movement in opposite directions to the shafts upon rotation thereof so as to separate the guide arms.

7 A device of the class described comprising a support, a threaded bearing carried by the support, a hollow shaft provided with similar threads rotatably received by said bar, a second shaft journaled in the said hollow shaft, a fixedly threaded bearing spaced from the first bearing, said second shaft provided with threads similar to those of the second bearing and adapted to be received thereby, a depending arm secured to the outer end of each shaft, means for maintaining the said arms in their normal position, said means serving to throw the guide arms into elevated inoperative position upon rotary movement of the shafts in the same direction, said threaded bearings adapted to impart longitudinal movement to the shafts in opposite directions upon rotation thereof.

In testimony whereof I afiix my signature in presence of two Witnesses.

JOHN L. JOYCE. Witnesses:

J. H. JoYon, F. V. J OYGE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

